Google Photos Sync (gphotos-sync)
Google Photos Sync is a backup tool for your Google Photos cloud storage.
Google Photos Sync downloads all photos and videos the user has uploaded to Google Photos. It also organizes the media in the local file system using album information. Additional Google Photos 'Creations' such as animations, panoramas, movies, effects and collages are also backed up.
This software is read only and never modifies your cloud library in any way, so there is no risk of damaging your data.
To get started see Tutorial
See https://gilesknap.github.io/gphotos-sync for more detailed documentation.